Lambda expression causes unused class to be generated

ExtendJ 8.0.1-218-g7c6c778 Java SE 8

ExtendJ generates an extra, unused, classfile.

Test code:

import java.util.*;

public class M28 {

  public int field = 3;

  public interface A {
    public B m(int i);
  }

  public interface B {
    public boolean m();
  }

  public A getA() {
    return field -> () -> {
      return this.field == field;
    };
  }

  public static void main(String[] arg) {
    M28 t = new M28();
    A a = t.getA();
  }
}

Expected result: No unused classfiles are generated.

Actual result:

The following classfiles are generated when compiling the test code with ExtendJ: M28.class, M28$A.class, M28$B.class, M28$1.class, M28$1$2.class, M28$3.class. The classfile M28$3.class is not reachable from M28.class and should not be generated.

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